Returns a SmartPointer to the newly created clone, and adds a record to the specified ID mapping object. If the cloning operation fails, a null SmartPointer is returned.
A shallow clone is a clone of only this object.
This function should not be called by client code; use OdDbDatabase::wblockCloneObjects() instead.
The default implementation of this function calls subWblockClone() for all objects hard-referenced by this object. This function can be overridden in custom classes.